Warning: Attempt to present <UIAlertController: 0x7fb6ab704950> on <UIViewController: 0x7fb6ab51c810> whose view is not in the window hierarchy!

标签：uiview   hierarchy   就会   nim   nbsp   童鞋   res   win   self   

对于在UIView上，是不能跳转的，所以我们通常要借助UIViewController，但经常会出现UIViewController没被加载的情况。这时就会报这个错。

解决方法：

 viewCon = (UIApplication.shared.keyWindow?.rootViewController)!
  self.viewCon.present(alertView, animated: true, completion: nil);

希望后面的童鞋不要掉坑里了哦！！！！

Warning: Attempt to present <UIAlertController: 0x7fb6ab704950> on <UIViewController: 0x7fb6ab51c810> whose view is not in the window hierarchy!

标签：uiview   hierarchy   就会   nim   nbsp   童鞋   res   win   self   

原文地址：http://www.cnblogs.com/laolitou-ping/p/6284811.html